Home › CDL Practice Tests › Air Brakes Questions › Question 72
With the engine off and brakes released, what is the maximum allowable leakage rate for a single vehicle?
- A.No more than 4 psi per minute
- B.No more than 2 psi per minute
- C.No more than 10 psi per minute
- D.Any loss is acceptable if the engine restarts
Correct answer
B. No more than 2 psi per minute
Why
The released-brake (static) limit for a single vehicle is 2 psi in one minute. Losing more means a leak exists that will only grow under working pressure and vibration.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-072).